it's been proving that encouraging healthy choices is much, much more helpful than any kind of shaming

and in fact, people who get into fat acceptance communities and start loving themselves and being okay with being fat tend to start doing better, because they don't feel that pressure and "well i'm worthless anyway." for example, they avoided swimming because they didn't want to be seen in a bathing suit, or avoided salads because they'd been laughed at ("who are you trying to fool?") before, and they start doing what they want and it's better for them

tl;dr surprise, hating people doesn't help them